grid isolation and backup power distribution [RE-wrenches]

Davis Terrell davis at brightearthsolar.com
Mon Oct 15 18:40:03 PDT 2007


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Wrenches,

I am trying to cook up an idea for back up power distribution for a 
cluster of buildings that are all fed from the same meter.... One way to 
go would be to have battery banks and inverters in each building, but 
this wouldn't work out for space reasons and not all buildings have good 
PV potential so the idea was to centralize the generation and therefor 
the battery charging... So I would like to use the existing distribution 
wires to feed the buildings back up power, using an automatic transfer 
switch at the service entrance to isolate from the grid and to feed 
inverter power down to the buildings.. BUT, there are some large loads 
that would not be practical to backup on battery power... SO the trick 
is to have some kind of automatic transfer switch that monitors the line 
in and instead of switching sources, it switches the output over to a 
critical loads panel and then waits for a manual reset back to the full 
house load panel once the utility power comes back on... Another trick 
is to feed the critical loads panel during normal operation in a way 
that won't backfeed the main panel during critical operation... Does 
this make any sense?  It seems like it ought to be possible some how 
instead of laying a second set of wires to all these different buildings 
when only one set is going be in use at one time anyway... Any ideas 
would be appreciated... Thanks

-- 
Davis Terrell
Bright Earth Solar
(802) 492-2273 / brightearthsolar.com


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